Apparatus for ultra short wave therapy



Oct. 17, 1950 CHAPPELL 2,526,064

APPARATUS FOR ULTRA SHORT WAVE THERAPY Filed July 29, 1944 3 Sheets-Sheet 1 ll Illlllllllllllljllllllll Hlllllllllll gllllllllllll Inventor ERMA/ED E. fi'bwppzu,

, I I q By @4015 W a i t tomeys Oct. 17, 1950 E. E. CHAPPELL 2,526,064

APPARATUS FOR ULTRA SHORT WAVE THERAPY Filed July 29, 1944 :5 Sheet s-Sheet 2 Inventor gum Manley 2f M5 Oct. 17, 1950' CHAPPELL 2,526,064

APPARATUS FOR ULTRA SHORT WAVE THERAPY Filed July 29, 1944 5 Sheets-Sheet 5 Inventor @mwz iM Patented Oct. 17, 1950 Es PATENT OFFICE APPARATUS FOR ULTRA SHORT'WAVE THERAPY Edward E. Chappell, Clear Lake, Iowa; Idonia :Chappell, executrix of said Edward E. Chappell,

deceased, assignor to Edward-L. Chappell Application July 29, 1944,1sm 1 No. 547,258

2 Claims. (01250-17) larly to apparatus for short Wave therapy using so-called ultra high frequencies contained within a wave length range between r'to 1.5 meters as the lower and between 4 and 5 meters as the upper limit. I

Therapeutical apparatus for frequencies corresponding to these ultra short-wave lengths had to be constructed for one fixed wave length which could not be adjusted. As a rule, in known apparatus, much lower frequencies, although still within the ultra shortwave range, such as the wavelength range between 18 and 6 meters, were used; but even with these lower frequencies, the oscillator units as a whole had to be made interchangeable if the apparatus had to be used with different wave lengths. e

It will be readily understood that this method of adjusting the wavelength has great disadvantage.

In order to'understand the importance of the question of adjustability it may be mentioned that the known type of apparatus in which almost invariably plate electrodes, application pads'or similar means to include the patient into the working circuit are employed, is generally used under the assumption that the numberof pathological conditions which can be treated effectively with ultra short waves is small, and that the frequency which is necessary for treating these cases is not material if well within the ultra short wave band.' It has however been found that this View does not correspond to the facts and that the use of different wave lengths for different cases of treatment is of importance.

Moreover it was also found that the forming of a circuit in which the patient may be included by means of electrodes, applicator pads, or other means is not only unnecessary but is a disadvantage.-

It is a primary and most important object of the invention to provide an ultra short wave apprinciple oftheinvention,'whi1e the'components and details may be subject to change and furpl-icator pads and other means to a patients system, memberor organ to be treated into the circuit and to treat the patient directly with radiated waves; This-method could not be used with apparatus having fixed wave lengths or only a-limited number of Wave lengths obtained by interchangeable units, because it was necessary in order to treat the patient with a desired wave length to place him at a considerable distance from the apparatus so as to restrict the possible reaction due to the introduction of the patient. Wherea treatment directly by radiation is envisaged, the patient has to be placed within a short distance of the apparatus and a correction of the wave lengths becomes inevitable. It can only be effected if the apparatus used is finely adjustable. From this explanation it will be seen that the jprovision of means permitting continuous adjustability has an immediate bearing on the method of application of the short wave energy.

With these objects in view the invention consists in an ultra short wave therapy apparatus in which continuous adjustability is obtained by means of metal bars or tubes arranged at a suitable distance and carrying a sliding tuning condenser, said tubes or bars serving at the same time as the means for radiating the energy toward the patient and thus forming the antenna, or aerial of the apparatus. I

I The invention moreover consists in the arrangement, construction and combination of parts as described in the following specification and as shown in the accompanying drawings. It is moreover to be understood that the fact that only one modification of the invention is shown is nQt to be interpreted in a limitative sense and that this modification is intended tobe illustrative of the ther modification without in any way departing from the essence of the invention or from the paratus for therapeuticalpurposes operating j within a range of wave lengths which, without any change of apparatus orof units, is adjustable to cover therapeutic treatments with different wave lengths. A further object of the invention is, therefore-to provide an adjustable apparatus which radiates waves of a definite selected length within. the ultra short wave band upon :proper adjustments 1 A further object of the invention dispensing" with a -special circuit-connected with the Wave generator "and using electrodes, ap-

consis'ts in apparatus; p e

Figures 3, 4 and 5 show one of the movable condensers in front "view, plan view and side view Figure 1 shows a top view of the therapeutic apparatus; 7

Figure 2 is an respectively.

. wFigurl 6 shows anfend view illustrating" the' 1 mounting of the resistors and fixed' condensers of the grid circuit.

elevational sideview of the same Figure 7 shows a diagram of the connection.

The apparatus is mounted on a base I and comprises electronic tubes 2, 3 which are cooperating in the customary push-pull connection.

The electronic tubes 2, 3 are mounted in the well known way on sockets 8 which are fixed on the base I, a bakelite plate 9 being interposed on which the socket rests. e

The grid terminals [ll of the electronic tubes are connected with two metal tubes 4, which are brass tubes of relativel large diameter and which are supported on porcelain standards 12, I3 either directly supported on the base plate I or mounted on wooden standards I4 arranged to reduce the length of the heavy porcelain stand: ards to the minimum necessary for isolation. The metal tubes 4, 5 which are connected with the rid in of the electronic tubes 2, 3 are relatively short. They are supported on the'porcelain standards i2, is by means of sleeves i5 fastened on the porcelain standards by screw bolts and adjusted by. means of nuts 16. A set screw ll passes through the. sleevea't right angle to the axis of the tube 4' or 5 heldby the sleeve and serves to clamp the tube to the standard.

With, short tubes onl one point of fixation is necessaryj If longer metal tubes are used a pair of standards may be arranged for holding each metal tube. In the first case it is preferable to maintain the tubes in exact parallelism at the required distance from each other to hold their ends by means or a transverse insulating porcelain or stone bar [8. As a rule connections have to be mean: these ends of the metal tubes and re uns purpose the ends of the tubes earry heads lascrewed intofor otherwise fastened to the tubes, whichheads are provided with a base plate and sew bolt 2| carrying a nut which serves to clamp the end of the tube to the transverse cross a ward a th sam t m s e as a bin as fof t n n ns W r y means of which the brass tubes 4, 5 are connected with other components or"; thegrid circuit. The cross bar I8, as shown, serves in this case as a flying support for alresijstance 122 and for condensers 23, 24, 25 (Figureffi) which are inserted into the. connection between the grid circuit and the ground. These elements are supported on the other side by a porce-, a s a dar 2.

On the two brass tubes 4, 5 a condenser designated in general by 27 is slidably arranged, which bridge the two metal tubes and also forms a bridge for the circuits connected. This condenser will be, described in detail below. The movement, of the condenser 21 along the tubes which on account of; their relativel large diameter and mass act as, a capacity for waves of the desired frequency adjusts the active capacity of the two grid circuits and a very fine adjustment and tuning ofthe circuits to a desired wave length can thus be obtained.

The anodes H; of the electronic tubes 2, 3 are connected with tubes of metal 6, I which are constructed'exactly like those above described in connection with the grid circuit and they are held in standards 4!, 42 constructed in the way alreadydescribed in connection with standards I2. and I3. As the tubes 6, 1 are of considerable length they are held in two standards 4!, 412. These metal tubes form part of the anode or output circuit and they serve simultaneousl as a means for radiating energy and as a tuning means. Riding on these tubes a sliding condenser 43 is arranged which is similar to the condenser 2'! and is shown in detail in Figures}, 4 and 5.-

This condenser is a mica condenser having a dielectric mica plate or sheet 28 against which the two metal condenser plates 29 and 30 may be pressed. Each of these metal plates is screwed to a short metal tube or spindle 3|, 32, respectively, which is provided with screw-threads 33, 34 at both ends. The screw threaded ends 34 0f the spindles carry the metal plates 29 and 30 of the condenser while the ends 33 of the spindles are screwed into sleeves 35, 36, respectively, which are slidably mounted on the metal tubes 6, 1. The entire structure of the condenser is firmly connected with a shield or base plate 56 of insulating material such as Bakelite or the like which is provided with cuts 31 and holes 38 accommodatin and holding the various parts of the condenser. The said shield or handle plate firmly holds the sleeves 35 and 36 and is provided with holes through which the spindles or short metal tubes 3% and 32 pass. The spindles 3|, 32 pass through the lateral cuts 31a and are supported by the tongues 38a, while the central recess '37 accommodates the mica condenser 43 (21) which consists of the mica sheet 28 and the metal plates .19 and 3a, as lready described.

Thev metal, mica and Bakelite parts described form a unit and are, firmly attached to each other and always are moving together. The upper portion of the Bakelite, shield 56 serves as a handle which may be seized by the operator and may be moved along he metal tubes, thus moving with it the enti e condenser arrangement.

A metric tuning scale 14 is. arranged; below the, tubes 5, 1 and a pointer 45 may be attached to the tuning condenser 43 which glides along the scale. The scale may be mounted on a separate standard or may be fixed to the box which en,- closes the lower part ofthe apparatus.

The coils 51 which are resistance coils when D C. is used for hea in the filament are arranged on the base plate i between the twostandards 4| and 42 or as shown are housed in a box 58 below the base plate I.

. The circuit connection is shown in Figure 7. The two electronic tubes forming the oscillation generator are connected in a manner which is usually termed a push-pull connection and which is well known in the art and need not be described in detail. However their operation is not that of the usual push-pull: arrangement. The grid circuits are shown as joined to the anode circuits by means of condensers 49, as usual in this type of circuit but it isto. be understood that any effective. ultra shortwave arrangement of the type described may be used.

The current supply for the anodes is provided by the radiating metal tubes. 6, I: which are connected on their farends with a center tapped secondarycoil; 5-! of; a transformer the primary of which isindicated at 54. The supply conductors 52, 53 of the primary are connected with the usual 60 cycle network.

The transformer may be housed in: a wooden box attached to the base plateofthe apparatus Thecenter connection of the, coil 5,! and the connection between the two cathodes of the elec. tronic discharge tube is grounded. Iaikewise one of the plates of condenser 25. connected with the resistances 22 may be grounded.

'In operation the tubes are. energized alternatively by'half-waves of the 60 cycle current, each tube generating high frequency currents during sucha half cycle in-a manner which is well known in the art and which has been. used in.

connection with diathermy apparatus and also for other purposes, the tuning of the output and of the grid circuits being performed by means of slidable condensers.

These slidable condensers 21, 43 offer means for adjusting continuously and very finely the efiective capacities of the two cooperating circuits thus permitting a tuning to the required Wave length. The two metal tubes 5, I operate as an aerial and radiate the high frequency energy generated in the electronic arrangement.

The persons to be treated have to be placed at a relativelyshort distance-a few feet-from the aerial; the wave length is then adjusted tentatively. The apparatus is operated and with the help of the usual instruments such as an open loop wave meter with sliding coil, a goniometer, or the like, the wave length is measured. As a rule it will diifer from the wave length prevailing before the presence of the persons to be treated. The condensers 21 and 43 are now readjusted until the proper wave length for the intended treatment is reached. The treatment may then proceed for the required length of time.

I claim:

1. An apparatus for ultra short wave therapy -with two electron discharge devices in push pull connection, each device having a grid and a grid circuit and an anode and anode circuit, comprising two spaced parallel metal tubes of equal length, each directly connected at one end with the anodes of the discharge devices respectively, said tubes forming the radiating system of the apparatus, the other ends of said tubes being connected with a center tapped secondary coil of a transformer, a source of current supplying the said transformer with A. C. currents, a slidable bridge between said metal tubes adapted to slide along them in permanent contact with effective equal lengths of the two metal tubes, said bridge containing a fixed tuning condenser, for tuning the radiating system, and further parallel metal tubes each connected with one of the grid circuits, with a further slidable and adjustable bridge in permanent contact with effective equal lengths of the two last named metal tubes in every position, and containing a fixed condenser for tuning the grid circuits of the discharge devices.

2. A tuning arrangement for radiating ultra short wave oscillator systems with two electrode discharge devices, as claimed in claim 1, wherein the fixed tuning condenser of each slidable bridge comprises parallel metal plates separated by an insulating plate, arranged between said metal tubes, the condenser plates of said condenser being arranged in planes substantially parallel to the metal tube axes, sleeves shdably arranged on and fitting over each metal tube, provided with transverse metal tubes, projecting towards each other, the latter being provided with means for holding the metal plates of the condenser, and a base plate of insulating material, carrying the condenser structure, and adapted to form the handle for sliding the condenser along said metal tubes, said plates having cut portions for accommodating the condenser and transverse bores for accommodating said transverse tubes holding the condenser plates.

EDWARD E. CI-IAPPELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,994,219 Hollmann Mar. 12, 1935 2,073,201 Esau Mar. 9, 1937 2,105,568 Webster Jan. 18, 1938 2,113,340 Evans Apr. 5, 1938 2,126,541 De Forest Aug. 8, 1938 2,138,161 Hansell Nov. 29, 1938 2,239,069 Worden et a1 Apr. 22, 1941 2,252,941 Mittelman Aug. 19, 1941 2,308,204 Parry Jan. 12, 1943 2,398,502 Morrison Apr. 16, 1946 2,404,745 Roberts July 23, 1946 FOREIGN PATENTS Number Country Date 528,345 Great Britain Oct. 28, 1940 108,640 Australia Oct. 5, 1939 OTHER REFERENCES 

